Proton Gen/2: emissions & environmental MOT failures
Emissions & environmental was a recorded failure area in 5.8% of Proton Gen/2 MOT tests in this dataset. It is most prominent on 2005, 2006 cars.
More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair cost: £100–£600 (rough UK ballpark, not a quote).
Emissions & environmental failures by year
| Model year | Tests | Fail rate |
|---|---|---|
| 2005 | 393 | 7.4% |
| 2006 | 576 | 7.5% |
| 2007 | 910 | 7.0% |
Methodology & source. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.